Steam-boiler furnace.



No. 755,972. PATENTED MAR. 29, 1904. 1

' r L. G. M. WEST.

sum/m BOILER FURNACE.

APPLIOATIOH FILED JULY- 9, 1903.

no 10mm. sinus-SHEET 1.

4 o 9 1 9 2 R A M D B T N E T .A P S E W M G L m 7 5 5 7 0 N STEAMBOILER FURNACE. APPLICATION FILED JULY 9. 1903.

1'0 IODEL.

UNITED STATES Patented March Q9, 1904.

PATENT OFFICE.

STEAM-BOILER- FURNACE.

SPECIFICATION forming part of Letters Patent No. 755,972, dated March29,1904.

Application filed July 9, 1903. Serial No. 164,872. (No model.)

To all whom it may concern.-

- Be it known that I, LoUIs G. M. WEST, a citizen of the United States,residing at Baltimore, Maryland, have invented certain new and usefulImprovements in Steam-Boiler Furnaces, of which the following is aspecification.

My invention relates to improvements in boiler-furnaces, and moreparticularly to the.

manner of feeding and controlling the flow of air to the furnace and tocontrolling of the flow of the gases or products of combustion withinthe furnace-chamber.

The objects of the invention are to insure complete combustion, therebypreventing the formation of smoke, and to provide means for forcing inthe air at certain periods during the operation of the furnace.

With these ends in view the invention comprises the construction andarrangement of parts hereinafter described, and particularly pointed outin the claims.

I have illustrated the invention in the accompanying drawings, in which-Figure 1 is a side elevation of the furnace with parts broken away. Fig.2 is a plan view of the furnace with the boiler removed. Fig. 3 is asection on line 1 1 of Fig. 1. Fig. 4 is a section on line 2 2 ofFig. 1. Fig. 5 is a front view. Fig. 6 is a sectional view on line 3 3of Fig. 1.

It will be understood that the boiler is of the ordinary horizontalfire-tube type, and I have deemed it unnecessary to show the tubeshere-, in and have also omitted various ordinary details, such formingno part of the present invention. The brickwork settings may also be ofthe ordinary construction, except as hereinafter specified.

Referring by reference letters and figures to the drawings, A indicatesthe boiler; B, the

brickwork walls; C, the stack, and D the grate.

These are of ordinary construction and operation.

My special construction and arrangement of the bafiies and passages inrelation to the bridge-wall for the purpose of securing a completemixture of the air and products of combustion I now describe.

Above the grate I provide a battle wall or arch E, which, it will beobserved, is a plain arch passing high enough above the grate to beclear of the bed of fuel and spaced also from the boiler to providespace between it and the boiler to permit passage of the products ofcombustion. This arch is in front of the bridge at a distance therefromand is hollow to provide an air-passage e, the air being supplied bypassages or flues' E and passing to the combustion-chamber through aplurality of evenly-distributed air-openings 6, preferably narrow andhaving vertically-flaring mouths opening to the rear and partly over therange of the bridge, as clearly indicated in Fig. 1.

The products of combustion coming from the front portion of the bed offuel pass part over and part under the arch and meet each other in therear thereof, causing an eddy in rear of the baffle-wall at the pointwhere the air which has been heated passing through the flues E issuesthrough passages 6 between the divided current and mingles intimatelywith the products of combustion before and during the passage of thewhole over the bridge. This insures a complete commingling of the airand products of combustion arising from the major portion of the bed offuel.

The bridge-wall is indicated at F. It is pro.- vided with an air chamberand passage f and with discharge-openings to the rear of thebridge-wall, as indicated in Fig. 2. Air is supplied to the hollowbridge-wall by the fines f in the side walls of the furnace, and by reason of the extent of these it will be seen that the air is thoroughlyheated in its passage and is in condition to insure complete combustion.

In rear of the bridge-wall and at'a distance therefrom I provide asecond bafile wall or arch, (indicated at G in Fig. 1,) and this I makein they shape shown, providing a space 9 for the passage of a part ofthe products of combustion beneath this arch and over the raised floor 6and another space 9 above the arch for the passage of the remainingportion above the arch and between it and the boiler.

and emerges in rear of the arch and downward. I

The major part of the products and air are deflected downward and passbeneath the arch. This second bafl'le wall or arch thus deflects anddivides the products of combustion and causes an eddy in the space inrear thereof, completing the commingling of the gases with the air whichhas entered through the bridgewall F. In addition to this function ofcausing eddies and a consequent thorough commingling of products ofcombustion and air the additional effect is secured of forcing a portionof the heated gases into more direct contact with the under surface ofthe boiler.

In rearof the bafllewall or arch is a fire-space, in which the air andgases are thoroughly mixed and consumed, and the more effectually toperform this an inclined floor H is provided, which rises graduallytoward the rear, where it joins a pocket I. Acontracted flue 7 from thepocket I leads into the space and passage in rear of the boiler. Thepocket I gives space for another eddy before the gases escape toward theboiler-flues.

By this construction, as above described, I succeeded in distributingand continuing the commingling of the air and products of combustionfrom the grate, so that the combustion is complete and the effectremarkable both in point ofcombustion and application of heat to thebottom of the boiler. This also exercises a lifting effect upon theheated gases, aiding in forming the eddy and deflecting them upwardlyagainst the bottom of the boiler. Thence the gases pass through thetubes of the boiler (not shown) and into the stack in the ordinarymanner.

The time when a boiler-furnace generates most smoke is when fresh fuelis applied thereto.

I have provided in connection with my improved furnace an improved formof air-supplying and draft-controlling mechanism, which will now bedescribed.

In the stack C is located a damper K, having a weighted arm k, tendingnormally to hold it in nearly horizontal or partly-closed position, asshown in Fig. 1. This arm Z1 is connected by a cord or chain Zr with theweighted pistonrod Z, the piston of which is located in the cylinder,which is preferably a hydraulic cylinder. A pipe Z leads into the bottomof the cylinder, which communicates by pipe Z with a suitable source ofsupply of pressure.

or motive fluid. A pipe Z connects the said pipe Z with a waste-pipe orthe like, and the communication between the cylinder and the supply andwaste pipes is controlled by valves having upwardly-extending stems Z ZThe upper end of each of these is pivotally connected to ahorizontally-disposed rod or bar M,having a weight m at one end andhaving its other end linked to a pivoted bar or lever N. This bar ispivoted at n and is engaged by the end of the rod 0 of thepressure-diaphragm or piston-chamber O, which chamber is connected bypipe 0 with the steam-space of the boiler. It will thus be seen that anyrise in steam pressure in the boiler will cause the bar or lever N toswing upwardly, thus pulling up the left-hand end of rod M, which willpivot upon the rod Z. This will cause the inletvalve for the hydraulicsupply to be opened, admitting water to the cylinder L and forcing thepiston thereof upwardly, allowing the weighted arm to swing the damperinto the position shown in Fig. 1 At the same time cord orchain 9 willbe loosened and through branch pulleys p p operate to allow the dampersP and P to be opened by the weights P admitting a normal amount of airthrough the passages e and f.

The free end of the lever N is guided in a bracket n, and weights Q andQ may be provided, as necessary,to correspond to the steampressuredesired.

When the door is opened to supply fresh fuel, it is desirable that thelever Nshould be shifted to operate the damper mechanism, and to thisend I provide a weight R, guided in an extension of the bracket andadapted to be lowered upon the free end of lever N by the opening of thefurnace-door, so as to overcome the pressure of steam inpressure-cylinder 0. This causes the bar M to be rocked, the left-handend lowering to close the waterinlet and the right-hand or weighted endrising to open the water-outlet, so that the water in cylinder L iswithdrawn and the piston allowed to settle down, opening the damper Kand partly closing dampers P and P, so that part of the air-supply willbe drawn in through the open door. The weight R is connected by a cord9" to an arm 8 on a rock-shaft S. A second arm .9 on this shaft isconnected by a cord 8 with the weighted end of a lever T, the weight ofwhich is suflicient to normally hold the Weight out of contact with thelever N. A second pivoted weighted lever U has one arm connected to thefurnace-door by a chain u, so that when the door is closed the weight ais elevated; but when the door is opened weight u is lowered upon theforearm of lever T, raising the weight thereof and allowing bar or leverN to-be operated, as above described.

The weighted piston Z is made to rise gradually in closing the damper Kby means of the spring L, as shown. A gradual movement of lever M isalso obtained by means of the spring m.

Having thus described my invention, What I claim is- 1. In aboiler-furnace, and in combination, a grate, a bridge-wall in rear ofthe grate having air-flues discharging rearward, a bafflearch locatedabove the grate in front of said wall, with a passage-way for theproducts of combustion above and below said arch, and also with apassage-way for said products between it and the bridge-wall, also withairflues discharging rearward, a second baflie- 'arch in rear of thebridge-wall and separated therefrom, said second arch having passagewaysfor the products of combustion above and below, whereby the products ofcombustion, after passing over the bridge-wall are divided, receive asupply of air and pass partly over and partly under the second arch andform eddies in its rear, substantially as described.

2. In a boiler-furnace, the combination with the grate, bridge-wall andboiler, of a singlev 3. In a boiler-furnace, the combination with thegrate, bridge-wall and boiler, of a single baflie-arch located above thegrate and spaced from the boiler to provide a flame and gas space aboveand below the same, said arch hav ing an air-flue andrearwardly-discharging exit-passages, a second arch in rear of thebridge-wall and also spaced from said boiler, and an inclined floorsloping upwardly from said rear arch toward the rear of the boiler andwith a pocket in rear of said inclined fioor,

substantially as described. In testimony whereof I afliX my signature inpresence of two witnesses.

LOUIS G. M. WEST.

Witnesses:-

HARRY MARTIN, JOHN. S. ANDREWS.

